Language Server: Improve hovered symbol resolution, fix renaming bugs, implement reference lookup

modules/gdscript/gdscript_editor.cpp

@@ -1459,8 +1459,13 @@ static bool _guess_expression_type(GDScriptParser::CompletionContext &p_context,
 	if (p_expression->is_constant) {
 		// Already has a value, so just use that.
 		r_type = _type_from_variant(p_expression->reduced_value);
-		if (p_expression->get_datatype().kind == GDScriptParser::DataType::ENUM) {
-			r_type.type = p_expression->get_datatype();
+		switch (p_expression->get_datatype().kind) {
+			case GDScriptParser::DataType::ENUM:
+			case GDScriptParser::DataType::CLASS:
+				r_type.type = p_expression->get_datatype();
+				break;
+			default:
+				break;
 		}
 		found = true;
 	} else {

modules/gdscript/language_server/gdscript_extend_parser.h

@@ -39,6 +39,9 @@
 #ifndef LINE_NUMBER_TO_INDEX
 #define LINE_NUMBER_TO_INDEX(p_line) ((p_line)-1)
 #endif
+#ifndef COLUMN_NUMBER_TO_INDEX
+#define COLUMN_NUMBER_TO_INDEX(p_column) ((p_column)-1)
+#endif
 
 #ifndef SYMBOL_SEPERATOR
 #define SYMBOL_SEPERATOR "::"
@@ -50,6 +53,64 @@
 
 typedef HashMap<String, const lsp::DocumentSymbol *> ClassMembers;
 
+/**
+ * Represents a Position as used by GDScript Parser. Used for conversion to and from `lsp::Position`.
+ *
+ * Difference to `lsp::Position`:
+ * * Line & Char/column: 1-based
+ * 		* LSP: both 0-based
+ * * Tabs are expanded to columns using tab size (`text_editor/behavior/indent/size`).
+ *   	* LSP: tab is single char
+ *
+ * Example:
+ * ```gdscript
+ * →→var my_value = 42
+ * ```
+ * `_` is at:
+ * * Godot: `column=12`
+ * 	* using `indent/size=4`
+ * 	* Note: counting starts at `1`
+ * * LSP: `character=8`
+ * 	* Note: counting starts at `0`
+ */
+struct GodotPosition {
+	int line;
+	int column;
+
+	GodotPosition(int p_line, int p_column) :
+			line(p_line), column(p_column) {}
+
+	lsp::Position to_lsp(const Vector<String> &p_lines) const;
+	static GodotPosition from_lsp(const lsp::Position p_pos, const Vector<String> &p_lines);
+
+	bool operator==(const GodotPosition &p_other) const {
+		return line == p_other.line && column == p_other.column;
+	}
+
+	String to_string() const {
+		return vformat("(%d,%d)", line, column);
+	}
+};
+
+struct GodotRange {
+	GodotPosition start;
+	GodotPosition end;
+
+	GodotRange(GodotPosition p_start, GodotPosition p_end) :
+			start(p_start), end(p_end) {}
+
+	lsp::Range to_lsp(const Vector<String> &p_lines) const;
+	static GodotRange from_lsp(const lsp::Range &p_range, const Vector<String> &p_lines);
+
+	bool operator==(const GodotRange &p_other) const {
+		return start == p_other.start && end == p_other.end;
+	}
+
+	String to_string() const {
+		return vformat("[%s:%s]", start.to_string(), end.to_string());
+	}
+};
+
 class ExtendGDScriptParser : public GDScriptParser {
 	String path;
 	Vector<String> lines;
@@ -60,6 +121,8 @@ class ExtendGDScriptParser : public GDScriptParser {
 	ClassMembers members;
 	HashMap<String, ClassMembers> inner_classes;
 
+	lsp::Range range_of_node(const GDScriptParser::Node *p_node) const;
+
 	void update_diagnostics();
 
 	void update_symbols();
@@ -70,8 +133,7 @@ class ExtendGDScriptParser : public GDScriptParser {
 	Dictionary dump_function_api(const GDScriptParser::FunctionNode *p_func) const;
 	Dictionary dump_class_api(const GDScriptParser::ClassNode *p_class) const;
 
-	String parse_documentation(int p_line, bool p_docs_down = false);
-	const lsp::DocumentSymbol *search_symbol_defined_at_line(int p_line, const lsp::DocumentSymbol &p_parent) const;
+	const lsp::DocumentSymbol *search_symbol_defined_at_line(int p_line, const lsp::DocumentSymbol &p_parent, const String &p_symbol_name = "") const;
 
 	Array member_completions;
 
@@ -87,10 +149,18 @@ class ExtendGDScriptParser : public GDScriptParser {
 
 	String get_text_for_completion(const lsp::Position &p_cursor) const;
 	String get_text_for_lookup_symbol(const lsp::Position &p_cursor, const String &p_symbol = "", bool p_func_required = false) const;
-	String get_identifier_under_position(const lsp::Position &p_position, Vector2i &p_offset) const;
+	String get_identifier_under_position(const lsp::Position &p_position, lsp::Range &r_range) const;
 	String get_uri() const;
 
-	const lsp::DocumentSymbol *get_symbol_defined_at_line(int p_line) const;
+	/**
+	 * `p_symbol_name` gets ignored if empty. Otherwise symbol must match passed in named.
+	 *
+	 * Necessary when multiple symbols at same line for example with `func`:
+	 * `func handle_arg(arg: int):`
+	 * -> Without `p_symbol_name`: returns `handle_arg`. Even if parameter (`arg`) is wanted.
+	 *    With `p_symbol_name`: symbol name MUST match `p_symbol_name`: returns `arg`.
+	 */
+	const lsp::DocumentSymbol *get_symbol_defined_at_line(int p_line, const String &p_symbol_name = "") const;
 	const lsp::DocumentSymbol *get_member_symbol(const String &p_name, const String &p_subclass = "") const;
 	const List<lsp::DocumentLink> &get_document_links() const;
 

modules/gdscript/language_server/gdscript_language_protocol.cpp

@@ -278,6 +278,11 @@ void GDScriptLanguageProtocol::stop() {
 }
 
 void GDScriptLanguageProtocol::notify_client(const String &p_method, const Variant &p_params, int p_client_id) {
+#ifdef TESTS_ENABLED
+	if (clients.is_empty()) {
+		return;
+	}
+#endif
 	if (p_client_id == -1) {
 		ERR_FAIL_COND_MSG(latest_client_id == -1,
 				"GDScript LSP: Can't notify client as none was connected.");
@@ -294,6 +299,11 @@ void GDScriptLanguageProtocol::notify_client(const String &p_method, const Varia
 }
 
 void GDScriptLanguageProtocol::request_client(const String &p_method, const Variant &p_params, int p_client_id) {
+#ifdef TESTS_ENABLED
+	if (clients.is_empty()) {
+		return;
+	}
+#endif
 	if (p_client_id == -1) {
 		ERR_FAIL_COND_MSG(latest_client_id == -1,
 				"GDScript LSP: Can't notify client as none was connected.");

modules/gdscript/language_server/gdscript_text_document.cpp

@@ -50,6 +50,8 @@ void GDScriptTextDocument::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("completion"), &GDScriptTextDocument::completion);
 	ClassDB::bind_method(D_METHOD("resolve"), &GDScriptTextDocument::resolve);
 	ClassDB::bind_method(D_METHOD("rename"), &GDScriptTextDocument::rename);
+	ClassDB::bind_method(D_METHOD("prepareRename"), &GDScriptTextDocument::prepareRename);
+	ClassDB::bind_method(D_METHOD("references"), &GDScriptTextDocument::references);
 	ClassDB::bind_method(D_METHOD("foldingRange"), &GDScriptTextDocument::foldingRange);
 	ClassDB::bind_method(D_METHOD("codeLens"), &GDScriptTextDocument::codeLens);
 	ClassDB::bind_method(D_METHOD("documentLink"), &GDScriptTextDocument::documentLink);
@@ -161,11 +163,8 @@ Array GDScriptTextDocument::documentSymbol(const Dictionary &p_params) {
 	String path = GDScriptLanguageProtocol::get_singleton()->get_workspace()->get_file_path(uri);
 	Array arr;
 	if (HashMap<String, ExtendGDScriptParser *>::ConstIterator parser = GDScriptLanguageProtocol::get_singleton()->get_workspace()->scripts.find(path)) {
-		Vector<lsp::DocumentedSymbolInformation> list;
-		parser->value->get_symbols().symbol_tree_as_list(uri, list);
-		for (int i = 0; i < list.size(); i++) {
-			arr.push_back(list[i].to_json());
-		}
+		lsp::DocumentSymbol symbol = parser->value->get_symbols();
+		arr.push_back(symbol.to_json(true));
 	}
 	return arr;
 }
@@ -253,6 +252,48 @@ Dictionary GDScriptTextDocument::rename(const Dictionary &p_params) {
 	return GDScriptLanguageProtocol::get_singleton()->get_workspace()->rename(params, new_name);
 }
 
+Variant GDScriptTextDocument::prepareRename(const Dictionary &p_params) {
+	lsp::TextDocumentPositionParams params;
+	params.load(p_params);
+
+	lsp::DocumentSymbol symbol;
+	lsp::Range range;
+	if (GDScriptLanguageProtocol::get_singleton()->get_workspace()->can_rename(params, symbol, range)) {
+		return Variant(range.to_json());
+	}
+
+	// `null` -> rename not valid at current location.
+	return Variant();
+}
+
+Array GDScriptTextDocument::references(const Dictionary &p_params) {
+	Array res;
+
+	lsp::ReferenceParams params;
+	params.load(p_params);
+
+	const lsp::DocumentSymbol *symbol = GDScriptLanguageProtocol::get_singleton()->get_workspace()->resolve_symbol(params);
+	if (symbol) {
+		Vector<lsp::Location> usages = GDScriptLanguageProtocol::get_singleton()->get_workspace()->find_all_usages(*symbol);
+		res.resize(usages.size());
+		int declaration_adjustment = 0;
+		for (int i = 0; i < usages.size(); i++) {
+			lsp::Location usage = usages[i];
+			if (!params.context.includeDeclaration && usage.range == symbol->range) {
+				declaration_adjustment++;
+				continue;
+			}
+			res[i - declaration_adjustment] = usages[i].to_json();
+		}
+
+		if (declaration_adjustment > 0) {
+			res.resize(res.size() - declaration_adjustment);
+		}
+	}
+
+	return res;
+}
+
 Dictionary GDScriptTextDocument::resolve(const Dictionary &p_params) {
 	lsp::CompletionItem item;
 	item.load(p_params);
@@ -450,7 +491,7 @@ Array GDScriptTextDocument::find_symbols(const lsp::TextDocumentPositionParams &
 	if (symbol) {
 		lsp::Location location;
 		location.uri = symbol->uri;
-		location.range = symbol->range;
+		location.range = symbol->selectionRange;
 		const String &path = GDScriptLanguageProtocol::get_singleton()->get_workspace()->get_file_path(symbol->uri);
 		if (file_checker->file_exists(path)) {
 			arr.push_back(location.to_json());
@@ -464,7 +505,7 @@ Array GDScriptTextDocument::find_symbols(const lsp::TextDocumentPositionParams &
 				if (!s->uri.is_empty()) {
 					lsp::Location location;
 					location.uri = s->uri;
-					location.range = s->range;
+					location.range = s->selectionRange;
 					arr.push_back(location.to_json());
 					r_list.push_back(s);
 				}

modules/gdscript/language_server/gdscript_text_document.h

@@ -65,6 +65,8 @@ class GDScriptTextDocument : public RefCounted {
 	Array completion(const Dictionary &p_params);
 	Dictionary resolve(const Dictionary &p_params);
 	Dictionary rename(const Dictionary &p_params);
+	Variant prepareRename(const Dictionary &p_params);
+	Array references(const Dictionary &p_params);
 	Array foldingRange(const Dictionary &p_params);
 	Array codeLens(const Dictionary &p_params);
 	Array documentLink(const Dictionary &p_params);